Remove Rugged::Walker from Repository#log

lib/gitlab/git/repository.rb

@@ -490,11 +490,7 @@ module Gitlab
           return []
         end
 
-        if log_using_shell?(options)
-          log_by_shell(sha, options)
-        else
-          log_by_walk(sha, options)
-        end
+        log_by_shell(sha, options)
       end
 
       def count_commits(options)
@@ -1512,27 +1508,6 @@ module Gitlab
         end
       end
 
-      def log_using_shell?(options)
-        options[:path].present? ||
-          options[:disable_walk] ||
-          options[:skip_merges] ||
-          options[:after] ||
-          options[:before]
-      end
-
-      def log_by_walk(sha, options)
-        walk_options = {
-          show: sha,
-          sort: Rugged::SORT_NONE,
-          limit: options[:limit],
-          offset: options[:offset]
-        }
-        Rugged::Walker.walk(rugged, walk_options).to_a
-      end
-
-      # Gitaly note: JV: although #log_by_shell shells out to Git I think the
-      # complexity is such that we should migrate it as Ruby before trying to
-      # do it in Go.
       def log_by_shell(sha, options)
         limit = options[:limit].to_i
         offset = options[:offset].to_i

spec/lib/gitlab/git/repository_spec.rb

@@ -899,44 +899,6 @@ describe Gitlab::Git::Repository, seed_helper: true do
       end
     end
 
-    context "compare results between log_by_walk and log_by_shell" do
-      let(:options) { { ref: "master" } }
-      let(:commits_by_walk) { repository.log(options).map(&:id) }
-      let(:commits_by_shell) { repository.log(options.merge({ disable_walk: true })).map(&:id) }
-
-      it { expect(commits_by_walk).to eq(commits_by_shell) }
-
-      context "with limit" do
-        let(:options) { { ref: "master", limit: 1 } }
-
-        it { expect(commits_by_walk).to eq(commits_by_shell) }
-      end
-
-      context "with offset" do
-        let(:options) { { ref: "master", offset: 1 } }
-
-        it { expect(commits_by_walk).to eq(commits_by_shell) }
-      end
-
-      context "with skip_merges" do
-        let(:options) { { ref: "master", skip_merges: true } }
-
-        it { expect(commits_by_walk).to eq(commits_by_shell) }
-      end
-
-      context "with path" do
-        let(:options) { { ref: "master", path: "encoding" } }
-
-        it { expect(commits_by_walk).to eq(commits_by_shell) }
-
-        context "with follow" do
-          let(:options) { { ref: "master", path: "encoding", follow: true } }
-
-          it { expect(commits_by_walk).to eq(commits_by_shell) }
-        end
-      end
-    end
-
     context "where provides 'after' timestamp" do
       options = { after: Time.iso8601('2014-03-03T20:15:01+00:00') }